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Finding the Fourth Proportional to 425,876.96, 638,028.11 and 215,011.28

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Solution

The fourth proportional to 425,876.96, 638,028.11 and 215,011.28 is: 322,119.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,876.96 : 638,028.11 = 215,011.28 : x
  2. Step 2: Convert to fraction form
    425,876.96/638,028.11 = 215,011.28/x
  3. Step 3: Cross multiply
    425,876.96x = 638,028.11 × 215,011.28
  4. Step 4: Simplify right side
    425,876.96x = 137,183,237,954.47
  5. Step 5: Solve for x
    x = 137,183,237,954.47/425,876.96
  6. Step 6: Final answer
    x = 322,119.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.